Adaptivity as a Property to Achieve Resilience of Load-Carrying Systems

Load-carrying systems often suffer from unexpected disruptions which can cause damages or system breakdowns if they were neglected during product development. In this context, unexpected disruptions summarize unpredictable load conditions, external disturbances or failures of system components and can be comprehended as uncertainties caused by nescience. While robust systems can cope with stochastic uncertainties, uncertainties caused by nescience can be controlled only by resilient load-carrying systems. This paper gives an overview of the characteristics of resilience as well as the time-dependent resilient behaviour of subsystems. Based on this, the adaptivity of subsystems is classified and can be distinguished between autonomous and externally induced adaption and the temporal horizon of adaption. The classification of adaptivity is explained using a simple example of a joint brake application.

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Analysis and Synthesis of Resilient Load-Carrying Systems

Proceedings of the Design Society: International Conference on Engineering Design ◽

10.1017/dsi.2019.146 ◽

2019 ◽

Vol 1 (1) ◽

pp. 1403-1412

Author(s):

Fiona Schulte ◽

Eckhard Kirchner ◽

Hermann Kloberdanz

Keyword(s):

Power Grids ◽

Resilience Engineering ◽

Development Methodology ◽

Load Carrying ◽

Analysis And Synthesis ◽

System Resilience ◽

Supply Systems ◽

Load Conditions

AbstractResilient systems have the capability to survive and recover from seriously affecting events. Resilience engineering already is established for socio-economic organisations and extended network-like structures e. g. supply systems like power grids. Transferring the known principles and concepts used in these disciplines enables engineering resilient load-carrying systems and subsystems, too. Unexpected load conditions or component damages are summarised as disruptions caused by nesciense that may cause damages to the system or even system breakdowns. Disruptions caused by nescience can be controlled by analysing the resilience characteristics and synthesising resilient load-carrying systems. This paper contributes to a development methodology for resilient load-carrying systems by presenting a resilience applications model to support engineers analysing system resilience characteristics and behaviour. Further a concept of a systematically structured solution catalogue is provided that can be used for the classification of measures to realise resilience functions depending on system adaptivity and disruption progress. The resilience characteristics are illustrated by 3 examples.

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A CONTROL LIST FOR THE SYSTEMATIC IDENTIFICATION OF DISTURBANCE FACTORS

Proceedings of the Design Society ◽

10.1017/pds.2021.6 ◽

2021 ◽

Vol 1 ◽

pp. 51-60

Author(s):

Peter Welzbacher ◽

Gunnar Vorwerk-Handing ◽

Eckhard Kirchner

Keyword(s):

Literature Review ◽

Product Development ◽

Model Theory ◽

Development Process ◽

Product Development Process ◽

Key Factors ◽

Starting Point ◽

Disturbance Factor ◽

Systematic Identification

AbstractThe importance of considering disturbance factors in the product development process is often emphasized as one of the key factors to a functional and secure product. However, there is only a small number of tools to support the developer in the identification of disturbance factors and none of them yet ensures that the majority of occurring disturbance factors is considered. Thus, it is the aim of this contribution to provide a tool in form of a control list for the systematic identification of disturbance factors. At the beginning of this contribution, the terms “disturbance factor” and “uncertainty” are defined based on a literature review and different approaches for the classification of uncertainty are presented. Subsequently, the fundamentals of multipole based model theory are outlined. Moreover, a first approach in terms of a control list for a systematic identification of disturbance factors is discussed. Based on the discussed approach and taking the identified weaknesses as a starting point, a control list is presented that combines the existing basic concept of the control list with the fundamentals of multipole based model theory.

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Time-Dependent Analysis and Classification of Deformation Mechanism in Head Impact Injury Using Image Based Finite Element Method (FEM)

10.1109/icmae52228.2021.9522452 ◽

2021 ◽

Author(s):

Haider Ali ◽

Zartasha Mustansar ◽

Saadia Talay ◽

Arsalan Masood ◽

Samrah Zahoor ◽

...

Keyword(s):

Finite Element Method ◽

Finite Element ◽

Deformation Mechanism ◽

Head Impact ◽

Time Dependent ◽

Impact Injury ◽

Time Dependent Analysis ◽

Element Method

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Structural Analysis and Life Prediction for Ceramic Gas Turbine Components for the Mercedes-Benz Research Car 2000

Volume 2: Aircraft Engine; Marine; Microturbines and Small Turbomachinery ◽

10.1115/86-gt-199 ◽

1986 ◽

Cited By ~ 7

Author(s):

H. Hempel ◽

H. Wiest

Keyword(s):

Gas Turbine ◽

Life Prediction ◽

Subcritical Crack Growth ◽

Time Dependent ◽

Relative Importance ◽

3 Dimensional ◽

Ceramic Components ◽

Dimensional Finite Element ◽

Ceramic Design ◽

Load Conditions

The paper considers the design and the application of ceramic components in a high temperature gas turbine, which is being developed as an alternative for passenger-car propulsion. Silicon nitride turbine wheels were analyzed using 3-dimensional finite element methods. Calculations of temperatures and stresses were carried out for several steady-state and transient load conditions. Time dependent reliability was also computed using the theory of Weibull including subcritical crack growth. The results of these calculations are presented and discussed. The basic theory for ceramic life prediction methodology is reviewed, including the relative importance of various parameters. From the results, conclusions are derived for ceramic design. Finally some operating-experiences of ceramic turbine wheels are reported.

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Time-dependent displacement behaviour of model adfreeze and grouted piles in saline frozen soils

Canadian Geotechnical Journal ◽

10.1139/t94-047 ◽

1994 ◽

Vol 31 (3) ◽

pp. 395-406 ◽

Cited By ~ 3

Author(s):

K.W. Biggar ◽

D.C. Sego

Keyword(s):

Field Studies ◽

Frozen Soil ◽

Silty Sand ◽

Time Dependent ◽

Test Results ◽

Model Pile ◽

Laboratory Test Results ◽

Load Carrying ◽

Pile Deformation

The findings of a laboratory study on the time-dependent displacement of model piles in saline frozen soil are reported. The short-term time-dependent pile deformation in ice-poor saline silty sand was best described using a simple power law of time, whereas the long-term time-dependent deformations were best described using a flow law formulation similar to that used to describe the long-term time-dependent deformation of ice or ice-rich permafrost. The use of cementitious grout as a backfill resulted in doubling of the pile load carrying capacity for a given displacement rate. The laboratory test results compare well with other laboratory and field studies. Key words : frozen soil, saline, model pile, time-dependent deformation, sand backfill, grout.

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